資訊系統委外是指將組織中資訊相關活動部份或全部的資訊系統功能委由外部資訊服務承包商執行，以得到所需的資訊服務系統。因中小企業受限於本身的資源有限，所以一般皆會透過委外的方式，快速取得企業經營活動中所需的資訊系統功能，以期改善中小企業的經營績效與競爭力。
在資訊系統委外的執行過程中，中小企業雖不需投入全部資源，但其中仍有一些影響委外成功與否的關鍵成功因素，需中小企業的相關業務負責人投注心力管理。本研究就中小企業執行資訊系統委外業務，從實務面的觀點，將委外業務分成兩階段：委外建置與委外營運並分別探討其關鍵成功因素對委外執行成效的影響。
中小企業將資訊系統委外，多數是希望藉資訊委外達成企業利益。但並非所有的委外都能得到期望的目標，且委外過程常存在著不同的風險，所以，在進行委外時，有必要了解委外的成功關鍵因素，以降低委外風險，提高委外成功的機會，使資訊委外成為企業達成企業目標之利器。

Information System Outsourcing is to outsource an organization’s partial or whole information system functions to an outside information service contactor in order to get the information service system it needs. Due to small and medium-sized enterprises’’ limited resource, usually they use outsourcing as a way to quickly obtain the information system functions needed to maintain their business operations, and hope to improve their business performance and competitiveness.
In the implementation process of outsourcing information system, although small and medium-sized enterprises do not need to invest all resources, they need to have relevant responsible people to put in efforts in order to make the outsourcing project successful. This research, from the practical viewpoints, is dividing small and medium-sized business information system outsourcing business into two stages: Development and Operation. Key Successful Factors are also being studied in details to see how KSF affect the results and performance of the outsourcing projects.
Small and medium-sized enterprises outsource their information system in the hope of obtaining best business benefits through outsourcing. However, not all the outsourcing projects achieved expected goals. Further, there’re many different risks in the outsourcing process. Therefore, it’s very essential to understand the KSF of information system outsourcing to lower the outsourcing risks, increase the outsourcing successful rate, and make information system outsourcing the best tool of achieving business goals.

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